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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cedb2e235afa5819a628afc6b59882eb8d552d7e789150c4a9590fbbdcc63f9' 
  AND token = 'YYc6y8yKc4FtnlQ7W7JI6MrGNjCaLyNWBrt17pn8IKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}